Test-Driven Development (TDD) overview

The classic Red/Green/Refactor loop per feature unit. For each unit of work: Red (write a failing test expressing the next small requirement), Green (write the minimum code to make it pass), Refactor (clean up with tests still green). An outer loop drives the full feature by sequencing units. Stops early if a unit cannot reach green within maxIterations as a signal to reconsider the design rather than pile on more code.